JPS60159418A - Shaft connecting structure - Google Patents

Abstract

PURPOSE:To eliminate the effect of swinging rotation by providing a transmission mechanism permitting only a predetermined relative turning between a tube and a shaft between a pair of elastic bodies for connecting the tube to the shaft. CONSTITUTION:A transmission mechanism 17 for permitting only a predetermined forward and backward relative turning between a tube 10 and a shaft 11 is provided between a pair of elastic bodies 12, 13. That is, a portion of the shaft 11 located between both elastic bodies 12, 13 is squeezed to form radial projections 18 while squeezing the short tubular portion of an outer tube 14 from both sides at positions corresponding to the projections 18 to form two sets of opposed abutting surfaces 19a, 19b and 20a, 20b and provide some gaps at both circumferential sides of the projection 18 for forming the transmission mechanism 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a shaft connection structure for transmitting rotation.

(Prior Art) As a conventional rotating shaft connection structure, there is, for example, a steering shaft connection structure as shown in FIG. 1 (Japanese Utility Model Application No. 56-62277). This is the engine of a car, etc.
The purpose is to prevent vibrations from the suspension from being transmitted into the single cabin through the steering wheel and increasing cabin noise. In other words, the upper shaft +0 on one end side
A center tube 102 which is connected to the steering wheel 101i through the center tube 101 and a lower shaft 103 whose one end is loosely inserted from the other end of the tube 102 and which connects the steering gear to the other end are attached to a vibration-proofing gong AlO4, 105. holes 106 and 1 in the radial direction of the tube 102 (7).
06, and radial protrusions 107, 107 that loosely fit into the hole 106 are formed at one end of the shaft 103, thereby constructing one transmission mechanism 108.

However, in such a conventional steering link shaft connection structure, the transmission mechanism 108 that allows only a predetermined relative rotation between the center tube 102 and the lower shaft lo3 in the forward and reverse directions is connected to both the vibration isolating rubbers 104, Since it was located closer to the steering wheel 101 than the shirt 105, is there any problem if the axes of the shirt 102 and the shaft 103 are aligned with each other? is both anti-vibration rubber 10
4.105 as a fulcrum, one protrusion 107 hits the side edge of one hole 106 unevenly, and there is a problem that smooth rotation cannot be transmitted.

In particular, in the case of a steering shaft of an energy absorbing steering device, which is connected by an intermediate shaft using two universal joints between the steering gear and the steering column, the bending rigidity of the intermediate shaft is particularly important. The problem is that such a steering shaft connection structure cannot be applied to an intermediate shaft because the steering shaft is low and tends to swing around easily.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems in the prior art. It is an object of the present invention to provide a shaft connection structure that eliminates the influence of whirling by providing a transmission mechanism that only allows the above-mentioned problems.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

2 to 6 show an embodiment in which the present invention is applied to an intermediate shaft of an energy-absorbing steering device. The steering shaft 1 is constructed by connecting a main shaft 3, which is a first rotating member, to which a steering wheel 2 is attached to the rear end, and a rear end of an intermediate shaft 4 through a universal joint 5.
The front end of the intermediate shaft 4 is connected to a gear shaft 7, which is a second rotating member, via a universal joint 6. 8
9 is a gear box that accommodates a rack-and-binion type steering gear, a pole nut type steering gear, etc., and 9 is a steering column.

The intermediate shaft 4 consists of a tube 10 and a shaft 11,
These are connected by the connection structure according to the present invention. The tube IO has a cylindrical shape, and the iK Uni/Sesal joint 6 is connected to it, and one end of the shirt 11 is loosely inserted through the opening at the other end with the axes aligned, and these are spaced apart in the axial direction. They are connected by a pair of annular elastic bodies iz and ia. Specifically, the inner circumferential surfaces of the elastic bodies 12 and 13 are vulcanized and bonded to the outer circumferential surface of the shaft 11, and the outer circumferential surfaces of the outer cylinder 14 are bonded.
They are vulcanized and bonded to the inner peripheral surfaces of the short cylindrical joints 15 and 16 at both ends, respectively.

A transmission mechanism 17 that allows only a predetermined forward and reverse relative rotation between the tube lO and the shaft 11 is connected to a pair of elastic bodies 1.
It is set between 2.18 and 18. That is, both elastic bodies 12.1
3, or as shown in FIG. 6, a separate member 8W! At the same time, the short cylindrical portion of the outer f#J14 corresponding to the protrusion 18 is crushed from both sides, or the L
Two sets of contact surfaces 19m, 19b, 20, and 20b facing each other are formed by welding and fixing the separate member 8 to the inner circumferential surface of the cylindrical outer cylinder, with a slight gap on both sides of the protrusion 18 in the circumferential direction. 1ull is given to constitute the transmission structure 17. The installation position of the transmission mechanism 17 is the intersection point where the tube 10 and the shaft 11 whirl around and the respective axes intersect at an angle, that is, the elastic modulus of one elastic body 12 against prying action is 1, and the other The elastic modulus of the elastic body 13 is assumed to be , and the distances from the transmission mechanism 17 to both elastic bodies 12 and 13 are respectively 1. , 1. As such, it is desirable to set the position to be kμm ”k*t2.

Such an outer cylinder 14 is press-fitted and fixed to the tube 10.

Next, the effect will be explained. When the vehicle is in a normal running condition, even if both elastic bodies 12 and 13 are torsionally deformed due to forward and reverse rotation of the steering wheel 2, the transmission mechanism 17 remains inactive, and the transmission mechanism 17 remains inactive, and the transmission mechanism 17 remains in an inactive state. The small impact force and the impact force caused by the pulsation of the hydraulic oil in the power steering device are buffered by the elastic bodies 12 and 13, and when the steering wheel 2 is rotated, a large torque is generated, such as when the steering wheel 2 is rotated. When transmitting, even if both the elastic bodies 12 and 1fl are elastically bent torsionally as fulcrums of the joints 5 and 68, and their respective axes intersect to cause whirling, the projection 18
The respective gaps between the contact surfaces 19a', 19b, 20m, and 20b hardly fluctuate, and smooth steering operation can be obtained.

Both elastic bodies 12. In order to increase the elastic modulus against torsional deformation without increasing the volume of la, the seventh
As shown in Fig. 8, inner protrusions 22m and 21m are formed at appropriate intervals in the circumferential direction on the joint 22.2B of the outer cylinder 21, and elastic bodies 24 and 25 can be adhered to the inner peripheral surface thereof. , and further the protrusion 22a.

An interleaf 26 made of gold Jg can be embedded in the elastic body 24, 25 between 2aa. 27 is color.

Note that this invention is not limited to the connection structure of intermediate shafts, and it is necessary to transmit rotation by reducing transmission of impact force, and to prevent external force in a direction perpendicular to the axis from acting in some way. It can also be used as a connection structure for a shaft, for example, the main shaft 3.

(Structure of the Invention) As explained above, according to the present invention, the structure includes a tube connecting a first rotating member at one end, a second rotating member having one end loosely inserted from the other end of the tube, and a second rotating member connected to the other end of the tube. a shaft that connects the rotating members; at least a pair of elastic bodies that connect the tube and the shaft with an interval 811' in the axial direction; and a predetermined distance between the tube and the shaft. It has a shaft connection structure with a transmission mechanism that allows only forward and reverse relative rotation.

(Effects of the Invention) Therefore, a relatively small torque transmission between the first rotating member and the second rotating member is performed via both elastic bodies, and the transmission of impact force is significantly alleviated. Torque transmission is reliably performed via the transmission mechanism, and the effect is that stable torque transmission is performed even when the axes of the tube and shaft intersect.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional steering shaft connection structure, Fig. 2 is a side view of an energy absorbing steering device to which the present invention is applied, and Fig. 8 is a half of an intermediate shaft according to an embodiment of the present invention. 4 is a sectional view taken along the line V-N in FIG. 3, FIG. 5 is a sectional view taken along the line V-N in FIG. 3,
FIG. 6 is an exploded perspective view of the intermediate shaft, FIG. 7 is a sectional view similar to FIG. 5 showing another example of the structure of the elastic body, and FIG. 8 is a perspective view showing another example of the structure of the outer cylinder. . 1: Steering shaft, 2 Steering wheel, 3: Main shaft (first or second rotating member), 4: Intermediate shaft, 5, 6; Unino 9-Sarge joint, 7: Gear shaft (second or first rotating member), 10: tube, 11: shaft, 12, 13. a4゜25=elastic body,
14, 21: Outer cylinder, 15, 1a, 22, 28: Joint portion, 17: Transmission mechanism, 18: Projection portion, 19m, 19b. 20M, 20b: Contact 1 (Fig. 6 1519° 20G (2i) Awn 20b Fig. 7 0

Claims (1)

[Claims] L A tube that connects a first rotating member to one end, a shaft that has one end loosely inserted from the other end of the tube and connects a second rotating member to the other end, and connects the tube and the shaft in the axial direction. It is characterized by having at least a pair of elastic bodies connected at a distance, and a transmission mechanism provided between the pair of elastic bodies and allowing only a predetermined forward and reverse relative rotation between the tube and the shaft. Connecting structure of shafts.